Having trouble winning.

Hi guys i have been playing fusion world for some time and can't seem to win that often. There is so much information out there on what to do but sometimes another youtuber that i watch can contradict that information immediately. I am not sure when i am supposed to attack the leader and when i am not supposed to. I know if an enemy attacks with a card in the battle area i should attack that if my leader let's me draw once but in that case do i just never attack my enemy leader? Plz guys i really need help (i like to play red decks. Specifically U7 and beerus)